Did a little "laundry" this weekend. I thought my seat belts were pretty clean to start with but it took two cycles of soaking in a bucket of dishwashing soap/hot water, scrubbing with a bristle brush to get them clean. After the 1st cycle, the water was black, after the 2nd cycle it just had a hint of grey. Did a final rinse and hang to dry! Tags came out like new
I was surprised to see some tags yellow, some white. The yellow ones were on the buckle assembly for the shoulder belts. All the other floor-mounted belts had white tags. Still need to check my roof-mounted shoulder belts.