The rpsexdoll silicone skin needs to be daily washed in accordance with materials science practice – a pH-neutral cleaner of pH 6.5-7.5 (such as a 3% solution of sodium dodecyl sulfonate), in combination with a nanofiber cloth having a friction force of ≤0.3N, can remove 98% of surface stains (particle size > 5μm). The 2023 RealDoll maintenance manual indicates that washing in warm water of 40-45℃ (with ±2℃ error) improves efficiency by 60% over cold water. But beyond 55℃, the hardness of the silicone (Shore A) will rise from 8±2 to 15±3, speeding up aging. For greasy marks (such as makeup residues), in the above-mentioned pressure and temperature of 35MPa and 32℃, supercritical CO₂ cleaning devices can reach an effciency of 99.8% after 5 minutes, while keeping the retaining ratio of material’s tensile strength ≥95% (the standard of test item ASTM D412). When the depth of stain penetration is greater than 0.2mm, alumina grinding particles of diameter 50-80μm (concentration 15%) must be employed for accurate polishing at a speed of 2000rpm to recover the surface roughness Ra value from 1.2μm to 0.4μm. In 2022, the Fraunhofer Institute in Germany tested and found that this process raised rpsexdoll’s skin light transmittance from 78% to 92%, but lowered material thickness by 0.05mm (shortening the service life by 8%). For stubborn stains (such as red wine dyes), irradiation with a UV-C light source having a wavelength of 405nm (30mW/cm² intensity) for 15 minutes can decompose 90% organic pigment molecules, and it will not cause the decrease in the degree of crosslinking of silica gel such as bleach (the corresponding C-Si bond strength retention rate by FTIR is 99.3%).
The processing of chemical contamination requires professional designs. When rpsexdoll is in contact with sulfur-containing substances (e.g., hot spring water quality) and discolors its surface yellow, soaking it in a compound solution of 5% hydrogen peroxide and 0.5% disodium EDTA for 2 hours can restore the L* value (brightness) from 65 to 82. DollTech’s 2024 accident report indicates that incorrect usage of cleaning agents containing isopropyl alcohol (concentration > 20%) can cause the swelling rate of TPE materials > 3%, requiring an 8-hour repair with supercritical fluid extraction technology (SC-CO₂, density 0.6g/cm³), with a cost of $500 per occurrence. Heavy metal contamination (e.g., lead level > 50 PPM) must be treated by chelation with 0.1M EDTA solution, along with atomic absorption spectrometry analysis, in an attempt to lower the contaminant level to < 5ppm (EU RoHS limit).
Disinfection and sterilization must be a balance between safety and efficiency. The 300W medical-grade plasma treatment system (frequency of 13.56MHz) is able to inactivate 99.99% of Staphylococcus aureus (ATCC 6538) in a 10-minute treatment, and the surface temperature is only raised by 2℃. The comparative tests show that although wiping with 75% alcohol can directly kill the virus, it will raise the friction coefficient of the silicone surface from 0.2 to 0.45 (tested in accordance with ASTM D1894), resulting in the degradation of the touch feel. The fresh Japanese method in 2023 employs a silver-loaded nano-titanium dioxide surface treatment (particle size: 20nm, concentration: 0.5%), which exhibits 8h-long antibacterial activity under visible light (bacteriostatic rate > 99%), and shows no impact on the material’s tensile strength (elongation at break remains 580% according to ISO 37 standard).
The repair techniques are dealing with a deep damage. If rpsexdoll scratches are > 0.5mm, the liquid silicone repair agent (5000cps viscosity) in 30 minutes is cured in vacuum injection molding machine with -0.08MPa pressure and the tear strength resistance at the repaired point can be up to 92% of the raw material (ASTM D1004 test). The case in 2022 for New York Restoration Center demonstrates that after texture matching with 3D scanning (accuracy of 0.03mm), multi-axis CNC milling can reproduce the original texture of skin (deviation in Ra value < 5%), yet the cost for one restoration is at $1200. For electrochemical corrosion (such as rusting of the metal frame caused by sweat), 10% oxalic acid solution soaking for rust removal and application of a 50μm thick polyurethane insulating coating for enhancement of salt spray test (ASTM B117) tolerance time from 72 hours to 1000 hours are needed.
Legal and environmental hazards cannot be overlooked. EU REACH regulation forbids the use of nonylphenol polyoxyethylene ether (APEO) type of cleaners. In 2023, a manufacturer was fined €250,000 for non-adherence. Replacement with alkyl polyglycoside (APG) cleaners with a biodegradation efficiency of over 90% is recommended. California Bill 65 stipulates that it is obligatory for volatilization emission of volatile organic compounds (VOCs) after cleaning to be below 50μg/m³. The rpsexdoll cleaning chamber should be equipped with an activated carbon + photocatalyst composite filter system (with a purification rate of 99.97%). Regarding industrial wastewater treatment, 200g polyaluminium chloride (PAC) per ton of cleaning waste liquid should be added to achieve sedimentation and flocculation in order to reduce the suspended solids (SS) from 500mg/L to below 10mg/L and costs $80/m³ to achieve the standards of discharge.