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These?;
TEPE Interdental Brushes Red Original (0.5mm) / Simple and effective cleaning of interdental spaces / 1 x 8 brushes https://www.amazon.co.uk/dp/B0056F762E/ref=cm_sw_r_apan_glt_fabc_QCY6QJW2AJ87687RRP40
The red one is perfect for USB-C
Edit: And if a brush doesn't improve things 100%, then try dipping the brush in 5% Hydrogen Peroxide solution before scrubbing the socket and drying off with an air duster. Most of the shit that fills up charging sockets is organic.