Second hand baby playmat

I just got this adorable playmat from a car boot sale, original price was £50 and I paid £4, absolute bargain. It was in its original packaging but had been used. It looks mostly as new but has (strangely) redish-brown stains on the centre bit (where the baby goes).

1. Do you think it's okay to put it in the wash? 2. After washing, is it okay to put my baby straight on it? Or should I put a blanket over it first? Thanks :)