GK Pro 5Ltr (Professional use only)
GK Pro 5Ltr (Professional use only)

GK Pro 5Ltr (Professional use only)

£79.00 EXC VAT
£94.80 INC VAT
Buy More & Save

Buy 4 of more for £72.68 EX VAT (£87.22 Inc VAT) and save 8% on each item

Buy 8 of more for £69.92 EX VAT (£83.90 Inc VAT) and save 12% on each item

Buy 12 of more for £67.15 EX VAT (£80.58 Inc VAT) and save 15% on each item

Buy 16 of more for £64.78 EX VAT (£77.44 Inc VAT) and save 18% on each item

Looking to buy 80 or more? Please Contact Us

5 people are viewing this right now
  • Estimated Delivery:Dec 04 - Dec 08

  • Free Mainland UK Delivery : On Orders Over £85 + VAT


This product is approved by the HSE (no.10766) for application by professionals only, by ticking this box you are agreeing that you meet these requirements.

I agree to the terms and conditons.

Image from - DM Cleaning of Shedfield

Before and After

GK Pro applied to Render

Product in use

Images from - Wolf Building Maintenance Services GK Pro Applied to various surfaces

Product description

GK PRO has quickly become the cleaning and maintenance sector's favourite chemical for eradicating biological growth. Simply following the dilution ratios and saturation levels recommended, ensures a predictable and successful outcome every time.

GK Pro’s primary function is as a reliable method of treating moulds, algae, lichens, and most other biofilms. It is a natural surfactant cleaner, so will foam vigorously when applied by brush or spray, this a great indicator to ensure all areas are treated. 

It can be used on almost ANY hard substrate (excepting green or sedum roofs) and is especially good for historic and fragile substrates including thatch.

GK Pro is applied at low pressure reducing the likelihood of damage that harsh scouring, scrubbing or water blasting can do.

GK Pro does not contain any harsh chemicals that many bleach-based cleaners incorporate. If used as instructed it will not oxidise or negatively impact on hard surfaces, or other component for example lead works, UPVC windows and seals. 

GK Pro acts only on living cells and is an effective sanitiser for 99·9% of bacterial matter.

For smaller areas no specialist equipment is required - a garden sprayer will do. Whilst applying appropriate PPE should be worn, we recommend protective gloves and eye protection/face protection as a minimum requirement.

The active ingredient (DDAC) offers residual activity and helps prevent premature recontamination.

Product Information Sheets

GK Pro Product Information Booklet

GK Pro Dilution Rates

GK Pro Safety Data Sheet

 HSE (no.10766) Following a routine check from HSE we can confirm that our product formulation is as stated.

GK Pro - HSE licence number : 10766

Review by Partridge Exterior Cleaning.

Roof soft washing with GK Pro

Partridge Exterior Cleaning are exterior cleaning specialists based in Burton-on-Trent. Sid is gaining a sound reputation for Roof Cleaning, Driveway & Patio Cleaning, and Gutter cleaning. He is becoming quite a YouTube sensation offering advice and good technical expertise to anyone who asks. Sid is genuinely a nice bloke and has a large following on his channel.

Product FAQs

How long will it take GK Pro to work?

This is dependent on the biological loading of moulds and algae, however GK Pro will kill biological growth on application, although it will take time for the effect to be seen.

Mild staining, results can be seen within days.

Heavier loads can take 2-3 months to see radical improvements.

In severe cases of contamination, it may take 6-12 months to work or to see the full results.

The reason for this is part of the removal process is dependent on the weather cycles to remove detritus and biological contaminants on our behalf.

However, the effects of subsequent applications or maintenance cycles will be seen quicker and usually within days.

When it it best to apply?

t can be applied all year round however results may be affected if rain occurs within 24 hrs and if temperatures are below 8 degrees Celsius.

As a minimum it is recommended that the product is applied on a dry day with little or no wind, and when rain is not likely for a minimum of 4 to 5 hours with temperatures at 5 degrees Celsius and rising.

Optimum gains can be made in warmer weather, and in conditions where there is minimal evaporation, allowing the surface to remain wet for longer, giving the product time to work.

Is GK Pro safe around children and pets?

Once dry GK Pro is safe around children and animals, however good practice is to keep them away during application.
GK Pro is plants safe provided you do not spray them directly. If you accidently overspray onto them, rinse down with clear water from a hose. It may scorch foliage, but it should not kill plants and grass lawns recover very quickly. It is good practice to protect them with waterproof fabric covers or plastic prior to spray.

On what surfaces can I use GK PRO, and will it cause any damage?

GK Pro is bleach, ammonia, acids, and solvents free.

GK Pro will not interact with any substrate or product that is not living and, unlike many other cleaners is non-oxidising so will not damage your outdoor surfaces.

It can be used on virtually any outdoor surface including tarmac, bricks and paving, concrete, decking, roof tiles, render, solar panels, Astroturf, canvas tents, caravans, conservatories, fibreglass boats, polytunnels, limestone, sandstone, marble, outdoor furniture, outdoor pots, outdoor painted surfaces, pool surrounds, slate, non-grass tennis courts, yacht sails. It can also be used to clean painted surfaces without the risk of damaging the paint film.

When used on decking, it can reduce the risk of this becoming a slip hazard, by removing bio films that contribute to decking becoming slippery.

Can I change the suggested dilutions given in the instructions?

Yes. If the staining is extreme, a stronger concentration will bring a quicker reaction.

However likewise, if you have cleaned the surface previously and you are simply providing a routine maintenance spray, as contamination is light, you can decrease the strength and the cleaning process will still be effective.

GK Pro is more effective in warmer weather and concentration levels can be reduced, however equally in colder conditions, concentration can be increased to facilitates results. Our dilutions rates are based on providing a baseline application that should work consistently

Each 5 litre pack can be diluted into 250 litres to make 255 litres of product to spray. Using a garden sprayer, you will get coverage of around 1,250 square metres. Some surfaces (i.e., painted or cladding) will use less but porous surface coverage could be in the range of 1,250 square metres – the dilution should be halved if used on a tiled roof.

GK PRO WhatsApp Trade Forum

Join our group to get support and advice from hundreds of users.

GK PRO WhatsApp Trade Forum