Just moved into a new property and it has a gas meter in the front garden. The cover on the meter is a hard plastic and is very dirty but also very shiny/sparkly. It almost looks like it's covered all over in snail trail type of shiny. After I used it I realised my hands were covered in very tiny shards of whatever shiny stuff it's covered in, cue very itchy hands and a rash - I had to work at my hands with sellotape to pull out the shards. Anyone know what this is and what is the best/safest way for me to clean it/ remove whatever this is?