Everyone on board every expedition ship has to clean their outer layers before landing on South Georgia, and again before Antarctica. The aim is to prevent seed contamination, particularly from Velcro fastenings on modern clothing, which might have gathered plant material from anywhere in the world. Once you have done your vacuuming, you need to sign to say that it had been done. We got checked, inspected, and personally interviewed by the local government at South Georgia - to ensure that we had followed the instructions!
Only later did we find out that if you breach the rules the “punishment” is to throw you in the South Georgia jail … which most of the time is used as a storage facility for their imported produce - including beer!
Corollary - Velcro:
To keep warm you need layers, and this includes on your hands - the secret is to have a pair of silk gloves that keeps your fingers warm. At one point I spent an hour wandering around the whole boat, searching for my silk gloves - only to find that they had become attached to the Velcro on the back of my trousers!