This is a question for a friend, she has a british bull dog which has brown stains on its face from its eyes and was wondering if there is such a thing to cover the stains. Sorry I can't be more specific as to tell the truth I was only half listening as I was in the middle of doing her nails and needed to concentrate.

You need to clean the eyes every day.
I use a small amount of optrex and wipe with cotton wool then
cover with sudocrem (nappy rash cream)

You can buy stuff to mask it but in the ring these arent allowed.

As well as the above, your friend could try a water filter.  It takes a few weeks to work but I have noticed a 100% improvement in our white face Bulldog.

Thanks for the replies I will pass them on, she doesn't show the dog so that isn't a problem I think she just likes him to look nice.