Soft washing in hot weather

February 24, 2023

Soft washing in hot weather

Knowing how to deal with soft washing "boil-off" on a hot day is an important and skilful facet of highly effective soft washing.

A summer heatwave brings several challenges to soft washing contractors, one of which is the change it makes to the chemical properties of softwash cleaning products.

High temperatures make Benz Lightning Cleanze biocide and Benz Bio Cleanze biocide more reactive (i.e. increases their strength). So it’s a good idea to increase the level of dilution on very hot days.

On most jobs there will be elevations that are cooler than others. So it can be best to use softwash chemicals at normal strength on the cooler elevations; and pre-wet the hotter elevations, which will, as well as cooling the surface, effectively increase the level of dilution.

In conditions of extreme heat, when rapid boil-off can be a serious problem, it's advisable to have someone pre-wetting surfaces immediately prior to treating them.

Quick tips:

1) Spray hot areas, roofs especially, to cool them down prior to giving a soft wash treatment.

2) Working small areas at a time is another excellent strategy for coping with boil-off.

3) Whenever possible, apply on cooler days and cooler times of the day: in the early morning and late afternoon.

4) When applying Lightning Cleanze, a useful approach can be to first apply at half strength, then gradually increase the strength as you get real-time experience on a specific contract.

We hope this information is helpful and sincerely wish you great success in your soft washing business,

Benz team

Click here to get more practical soft washing how-to tips

How to find answers to most soft washing questions: Simply enter a relevant "keyword" or short phrase – e.g. keyword for the above link = "how to" – into our in-site Search Engine (magnifying glass icon on the main menu).

Click here to download our Product Documentation Pack (includes Application & Dilution guides, SDS, PDS, RAMS, PPE & Mask info, COSSH, sample Contract and more)

Order Benz Softwash chemicals & equipment online or by phone:

GB (England, Scotland, Wales)

Phone: 0800 70 74 222 


Ireland and other countries

Phone: 00353 214 622 978


Lines open Monday - Friday, 9am – 5pm

Please note: The above numbers are for orders only (click here for tech support)

PS: Click here to set up your "Clean & Maintain" programme
. After completing an initial soft wash treatment, put your customer on a "Clean & Maintain" ongoing maintenance programme. Your customers will enjoy a permanently clean property and you will enjoy a steady stream of repeat business.

This is clearly a win-win arrangement for you and your customers.


Click here to explore the extensive range of Benz softwash cleaning chemicals & equipment

Benz Softwash Bio Cleanze DDAC biocide & Benz Softwash Lightning Cleanze SH sodium hypochlorite biocide

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