Hi many years ago when we had ours , put in washing machine on low temp ,perfect ,but if i remeber right, a bugger to iron as they came out creased quite badly
well they survived,they even survived my 14 year old son putting them in the tumble-dryer! He was supposed to bring it in if it rained and I think he forgot so thought he would just stick them in the dryer, it's a good job it doesn't get to hot.
I have washed both Conway and Trigano inners and roof liners in the washing machine. I line dried them and folded them as soon as they came off the line- didn't even need ironing!
I can't remember who advised me (may have been Sunncamp or the place where we purchased the trailer tent) but we were advised that they are supposed to be washed in proper soap flakes (not detergent) as this affects their waterproofness. I did this only at a low temperature (30 degrees) in our machine and they were all fine.