TC reported windscreen at the A side hasa black rubber stain at the lower part of the glass. TC rep orted windscreen at the A side has a black rubber stain at t he lower part of the glass. ~~~~~ 3630 TC reported windscreen at A/S has a black rubber stain at the lower part of the glass.  3630 windscreen black rubber stain cleaned/removed.    Checked windscreen condition - OK.  Syukur 44878