Chromexcel loves a light hand. Wipe down with a horsehair brush after each wear, and every few months rub in a small amount of Venetian shoe cream or Saphir Renovateur to feed the hide and revive the pull-up.
Do not over-condition. The leather is already hot-stuffed with oils and wax at the tannery, a thin coat once a season is plenty.
For deeper cleaning or a resole, bring them into the shop. Blake construction means these can be resoled two, three, four times over. Built to last decades, not seasons.