Star brite Sail & Canvas Cleaner - 16 oz by Star Brite

Very good product. Will last a good three years Highly recommend.

Our boat's cover had years of mildew staining and general grime built up that regular soap and water wasn't touching anymore, so I picked this up on a recommendation from a guy at the marina who swore by it for canvas. Diluted it per the instructions since it's concentrated and I didn't want to risk anything too harsh on the fabric. Difference was pretty dramatic honestly, scrubbed a section as a test first and the mildew stains lifted way better then our usual boat soap ever managed. Went over the whole top and most of the discoloration came out, a few of the oldest, deepest stains faded but didn't disappear completely, which is probably more on the age of the canvas than the cleaner itself. Fabric doesn't feel stripped or overly dried out afterward either, was worried a concentrated cleaner might be rough on the material but it rinsed clean and the canvas still feels normal, not stiff or brittle. Smell isn't overpowering while scrubbing, which matters when your working in an enclosed cockpit area for a while. Concentrate goes a long way too, used a small amount diluted in a bucket and still have plenty left in the bottle after doing the whole boat. Only downside is you really do need to let it sit and agitate a bit on tougher stains, doesn't just wipe away instantly like the label kind of implies. Great value for how much canvas it can clean per bottle.

All stains were gone, really efficient

I got this to remove stains from canvas shoes. It wasn't as effective as baking soda and peroxide. But man does it work on soles. Full strength with a toothbrush, and it goes to town. Though it wasn't good for my initial needs, I'm very happy with the purchase.

It removed the dirt with just a little scrubbing