Just go to the equipment part of the equipment screen (ie. the same place you find engines), go to sell, and you'll see the mech salvage in there (along with all your other non-weapon equipment).

You don't get much for it, so you're usually better salvaging equipment if you're looking for stuff to sell, and only getting mech salvage for mechs you want.

Aha. That works! Thanks.

Sounds like v1 salvage. Definitely want to keep that under control, counts as inventory items, so will contribute to the inventory limit.