How to clean rubber transom

[Hadams]

Can anyone recommend a product that I can clean the rubber transom with please? It’s got lots of black spots that I just can’t seem to get off, they almost look like mould. I have tried Cif and lots of other boat cleaning products but none seem to touch it.

[Clivert]

It is mould.
Try patio magic or cilit bang mould remover or similar.
It is a well known problem

[HappyAfloat]

We found Everbuild PVCU solvent cleaner to work.

[tiger79]

I tried uPVC cleaner, which didn't do much.  Most mould remover sprays are simply diluted bleach in a fancy bottle, so it's much cheaper to use regular bleach.  This will get most of the staining off, but it won't look like new.

[Yngmar]

The Everbuild PVC solvent cleaner worked well for us. Gotta follow the instructions though: It's a solvent cleaner, so you must apply it and wait for the solvent to soften the material. Then you wipe it off, which effectively removes some of the material along with the dirt. Just like polishing gelcoat, there's only so many times you can do this before you're through 

[Lazy Pelican]

Polish or a mild abrasive like CIF worked for us.

[geoff]

Astonish, cheap Vim type cleaner works well. Most pound type shops sell it. Geoff

[fjoe]

"Magic Eraser" or "dirt rubber" is working as well.

[artemis]

Try Jiff I think its called household cleaner that will do the trick

Mike
Artemis

[Goboatingnow]

Acetone is what I use, great on fenders  too