[MadOnVaux!]

Every so often when my washer level is low, i'll empty the bottle, fill with a jug of hot water (From the tap) and run it through with the pump until it runs clear...that way it cleans the lines, jets and the bottle, although ive just had to dismantle it all as some weird mutant skin had formed inside the bottle and clogged the little rubber filter/gasket!

I'd advise against running the washer pump for long periods, as its possible to burn them out, something ive done in the past, luckily mine is easily accessible, so easy to change, some are not.