We had it sussed. A complete change of clothes on the coach, & throw away everything you wore during the event.
There are locals who offer showers in the streets outside their houses, & a stream where we sluiced off, just on the edge of town.
As stated, I wouldn't have missed it, but never again.
The other good thing is there is a code which people adhere to. You have to squash the toms before you throw them, & you don't interfere with people's clothes to shove down backs etc.
& No! I'm not going to San Fermin