There is a large supermarket that has an aire behind it, on the way down passed the main city and towards the border post. Water and dump available but not attractive, as it is also the lorry entrance for the supermarket.. It does have some signs but need looking for. I went into Andorra 3/4 full of diesel and wished otherwise as it WAS 80cent a litre, but have been told it is of dubious quality by others, although it does come from Spain so should be the same as theirs.
I got turned out at the border to Spain by the Spanish customs. when I asked why, it Was told they were searching for GOLD AND CIGARETTES.. that is a laugh as the so called gold would be gold plated Tungsten block.. Big scam I though they would know about. lots of GOLD is like that to catch the muppets. I did think they were going to seize my new drone though.