Apply extra strength paint remover. Seal area with KILZ and paint using stucco paint. Sand blasters can be rented for under $100 per day to clean large areas.
GOOF OFF works well on latex paint but not oil-based. KLEAN STRIP or STRIP X clean oil-based aluminum surfaces. Use small amounts and test areas before attempting to clean entire area!
On painted surfaces, use KILZ to seal and follow with paint in a color closely matching the original color. Use KLEAN STRIP or STRIP X for removing graffiti from stained or varnished surfaces.
Use paint removers such as OOPS or STRIPEEZE - full strength. Rinse completely.
Glass or Plexiglas
Carburetor cleaner and cloth rag.
Try carburetor cleaner first. If that doesn’t work, use STRIPEEZE or OOPS
Brick, Cement, or Concrete
Use extra strength paint remover. Apply with a wire brush and scrub. Allow to dry. Process may have to be repeated before the area is ready to paint.