have gutters facias soffits 2 clean on tues i use hard surface cleaner as no no ubik r virosol sold in dublin it cleans very well.my question is this.is d stain permanent??? seen other treads about it @no one seems to to say yea r nae.r does it mean more scrubbin on d glass so more work 4me. chem will b diluted,r should i spray water on glass b4 fsg. have i just ans part of my own question here..... have n a homer simpson moment here i think haha ....thanks 4 any help u can give me