Place the glass prisms on a towel and wipe each one with a lint-free cloth to remove dust.
Combine equal amounts of white vinegar and water in a bowl. Dip a clean, lint-free cloth in the solution and wipe each prism. If dirt remains, swish dirty prisms in the bowl of vinegar and water.
Dry the prisms with lint-free cloths. If any dirt or smudges remain, continue to the next step.
Spray the prisms with window cleaner to remove any remaining dirt or smudges. Rub each prism with a clean, lint-free cloth.