Supporting Peter Sefton above, the Robert Sorby paring chisels are superb for jobs like cleaning out dovetail housings. I've had a couple for donkey's years. They are thin, light, and the smaller sizes have a bit of flexibility in them (I gather they're made from a grade of spring steel) which really seems to help with cut control. Edge-taking and edge-holding are good (I grind mine at about 20 degrees, and hone at about 25 degrees, but never use them with a mallet.
For something needing a bit more 'beef', to allow heavy pushing by shoulder (a task that comes to mind is paring a wooden plane blade bed), then Henry Taylor make (or made) paring chisels with a heavier section, but with rather squarer edges than the Sorbys, so they don't get into a dovetail housing as easily. Vintage would be another good source, but expect to pay rather more than you would for a run-of-the-mill Ebay chisel.