Lacquer thinner to clean wedges? I've always wire-brushed the wedges, as well as sanding and wire-brushing the bow-irons. I bend the stirrups, then sand and wire-brush them. Then torch-blue them. The overall effect is much nicer than leaving them in the original state.
As far as stirrup-size is concerned, Alchem/garvin stirrups are substantially larger than most of the one-foot stirrups I have seen. Period ones are normally rather smaller. Still given the price alchem charges, the bow-iron/wedge/stirrup sets are a great deal... assuming they ever arrive. Certainly it beats the dickens outa the old days when I cut my bow-irons from thick bronze plate. It took all bleedin' day to turn out a half-way decent set of bow-irons.
Note that Darkwood Armory is now producing a set of bow-irons and stirrup that look very nice... much more delicate work than Alchem's, but they should be quite sufficiently strong. They don't offer good wedges yet, but I can make up my own wedges and keepers from 3/8 in. square bar stock in half an hour, so it's no big problem. Geezer