Has anyone retrofitted a small auto shop with simple, durable pollution controls? Last month I helped a 4-bay garage cut VOCs about 38% with an enclosed parts washer + carbon canister and a $600 cyclone dust collector, but first-flush stormwater is still oily — looking for field-tested add-ons under $2k (coalescing inlets, sorbent socks, or permeable pavers) that hold up to winter salt.