Clean hollow gold initial pendants using the same gentle method as all hollow gold jewelry: soak in warm water with a few drops of mild dish soap for 3-5 minutes, then gently scrub with a soft-bristle toothbrush, paying special attention to the letter's interior curves (the interior of 'B', 'D', 'P', 'R', 'O', 'Q', 'G'), the bail junction, and the seam edge of the hollow form. Rinse thoroughly and dry completely before storage.
Letter-specific cleaning considerations: closed letterforms (A, B, D, O, P, Q, R) have interior enclosed or partially enclosed areas where skin oil and soap residue accumulate between the letter's inner strokes and the backing. Use the toothbrush to clean the interior of these enclosed areas with a back-and-forth motion following the letter's stroke direction. For hollow initial pendants with diamond-cut or textured surface finishes, work the toothbrush along the cut facets rather than across them to remove debris from the recessed texture.
Avoid for hollow gold initial pendants: ultrasonic cleaners (vibration stresses the seam welds that join the front face panel and back panel of hollow letters); steam cleaners (pressurized steam can enter hollow letter interiors through micro-gaps and is difficult to evacuate completely); chlorine and bleach-based cleaners (react chemically with the copper and silver alloy components of 10K and 14K gold, particularly at seam edges). Professional cleaning ($20-$40 at a jeweler) is appropriate annually for hollow initial pendants worn daily.