Power Washing and Roof Cleaning Forum

Hey guys I've got this white soffit that has some brownish red stains. I used the house wash mix to hit it and it didnt really do much. Tried scrubbing with purple power and an extension brush and that helped but they are still there. Any ideas? A roof mix? Or I have seen tsp being used for stains? Have some gutter grenade. I didnt know if a light solution would take care of the stain.Just not really sure. Said he had it cleaned last year by another company and he wasnt happy with the stains still there and they didnt do anything for him. Told him I would do the best that I possibly could but it looked stained and didnt know how much will come off. Hes going to be a repeat customer for sure if I can make him happy. Any ideas?