I bought this product to be used in conjunction with the Renovo Ultra Proofer, as most customers would.
I have applied this Canvas Cleaner product to the roofs of both a 2001 Vauxhall VX220 and a 2004 VW Beetle Convertible, but wasn't really impressed by it's ability to draw out dirt, green moss stains etc from the roofs. These particular roofs were not heavy soiled or damaged, but I wanted them looking thier best, before I applied the Ultra Proofer.
I do wonder whether simply a traditional house mild detergent would be just as effective as this product (along with arag or soft brostle brush) at attempting to remove dirt from canvas roofs, as despite me following Renovo's instructions 'to the letter', there was hardly a transformation in the appearance of the canvas!
The Renovo Ultra Proofer on the other hand I was pleased with. Follow the instructions and it will work very nicely. With regard to the Canvas Cleaner, I'll probably opt for Autogylm's alternative next time, as I've read some strong reviews about that.
Hope this helps.