垢 - dirt, grime, earwax

dirt; filth; grime

account (e.g. for an online service)

secondary account (on social media, etc.); second account; extra account; backup account

female assistant who scrubbed customers at public baths and also offered sexual services (Edo period)

anonymous account (on social media; used alongside one's main account); secret account

private account (on social media, esp. Twitter); account that can only be viewed by approved followers

to be refined; to be polished; to be stylish; to be sophisticated

pure; purity

pure and innocent; immaculate

throwaway account; burner account

secondary account (on social media, etc.); second account; extra account; backup account

fur; incrustation; limescale