I use Ecover Truck Wash. Recommended ratio is 15% and it works for me.
Here's some shots of the last conservatory clean I did You are not allowed to view links.
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I emailed them to the customer's work address before she'd finished for the day - she was delighted. Shots 5 + 6 look a bit dramatic, but the sun came out
Oooops, sorry shortcleaner - put the solution at 15% in a pressure sprayer, pump up, spray on, leave for 5 minutes, don't let it dry out, brush, then rinse. Job done, accept the applause.
