Hey my window washer bottle leaks to empty everytime i fill it up and i cant find the problem so should i just replace it and if so how much do you think it would be or take it out again and try to find the problem cheers:)

take it out and try find the leak
you may have to just replace it if it is a crack in the bottle it self, unless it is a leaky pump seal or something

as Leroy said, remove the bottle and fill it up with water and see where it leaks from...my bet is that its leaking where the washer motor clips in...just seal it up with some roof and gutter silicone..if its a crack just do the same - smear roof and gutter silicone over it...just make sure the surface is clean and dry first

even if it's completely foobar, a 'new' one from a wrecker shouldn't be more than $20.