Removing yellow "stains" from PVC pontoons

[MMcCawley]

Hi, I have an older Quicksilver PVC inflatable that has yellow stains over much of the bottom surface of the pontoons. I've read through the posts where people recommended cleaners (some of which I've tried including Bar Keepers, Soft Scrub, Comet, etc) but I still haven't been able to restore the pure white color (which may be impossible). Does anyone have any magic stain removers that they can recommend?

[willk]

'Lo and welcome to RIBnet.

When you dredge the forum and collate the results, the two big winners for stains seem to be Sodium hypochlorite (bleach) and/or Oxalic acid. In moderate concentration, i.e. 10%, both should be OK with PVC.

HTH

[kerny]

Originally Posted by willk

'Lo and welcome to RIBnet.

When you dredge the forum and collate the results, the two big winners for stains seem to be Sodium hypochlorite (bleach) and/or Oxalic acid. In moderate concentration, i.e. 10%, both should be OK with PVC.

HTH

Talking of Yellow, what's your avatar all about Mr willk ??

[willk]

Originally Posted by kerny

Talking of Yellow, what's your avatar all about Mr willk ??

It's a long story, it's staying until Monday.

[MMcCawley]

Thanks for your input. As mentioned, I've tried Bar keepers which has Oxalic acid. Initially, i wasn't impressed but i looked at the boat again this weekend and it looks a few shades whiter than a few days earlier when i had cleaned off the detergent (almost like it was continuing to clean). Still not perfect but getting better. I scrubbed it again yesterday and added a small concentration of bleach so I'll let you know how it goes this time.

Thanks for the input!