I quote ken Hom
Scrub first to remove any machine oil, this should be the only time you scrub your wok unless you let it rust
Dry and put onto a low heat
add 2 tbs of oil and rub over the inside with kitchen paper
Heat slowly for 10-15 minutes and wipe again with the kitchen paper, which will be blackened
Repeat the process to coating, heating and rubbing until the paper wipes clean.
wash in plain water with no detergent. Dry well before putting it away