so yesterday i tried to clean a bit... i thought the hard part would be the concrete, I was WRONG the window frame is alluminium and i cant get that shit cleaned. tried everything, even engine cleaner with metal pad it just wont go away, i think i'll need to use sand paper but i dont want it to be shinny. :dunno:

and if me scrubing for 1 hour same place doesnt clean it, i dont think a presure washer would either.