Headlights coming on themselves

Hi

I had my battery go flat, charged it and was ok for a little while but has since gone flat a few times since. I found that the headlights were coming on despite being in the off position. There has been some moisture got in to fuses I think due to me pressure washing van !! oops. I have checked the blade headlight fuses and they are ok.......but there are I guess relays above the blade fuses. When I connected charger to battery today the headlights came on straight away....so need some advice. Probably all my fault for pressure washing van a few weeks ago  

Have managed to get a good diagram of relays ......the headlight relay is wet......so removed and have ordered a replacement. Hope that is the only problem !!

https://www.dropbox.com/s/119715h6dszpkf8/25897332-bh0wtiwwpwfg2tac5ghulxu0-1-0_0.png?dl=0

You can probably dry it out OK but a new one will be better

Have dried and cleaned old one and put it back in............charging battery at present and so far headlights not on !