hi guys. patulong naman. the fabric ceiling and side panels of my van is very dirty from years of accumulated smog, dust and some stains. blackened and unhygenic. ive no idea how. san ko pwede pa-shampoo and cleaning? how much and how long it takes? sna yung affordable. kung may address at contact details kyo nung mga nasubukan nyo na. paki na lang. salamat at merry christmas