Whether brick is ready comes down to three tests: is it clean, sound and absorbent? Washing removes dirt, moss and loose material; efflorescence, the white salt bloom, signals moisture moving through the wall; and a splash of water reveals any old water-repellent sealer that would stop the lime soaking in.
Some fixes come before any finish. Cracked mortar, failed caulking, leaking gutters and soil heaped against the wall are repaired or flagged, because breathable limewash lets moisture out but does not stop it getting in. Where a house predates 1978, any scraping or removal of old paint has to be done lead-safe, by a firm holding certification under Washington’s renovation rules.