easiest screen or all to fit
string wound slid it in and pull the string out nice and gentle
my tips hold or tie up the unpulled end of the string because when you pull it can come thru
i wouldnt use washing liquid
slowly round the corners

once you do a few you know how hard you can bash it to get it in faster but sring round and crossed over and just pull it til it drops ino the hole
i'd start the string at the top nearer one corner with the rubber at the bottom already tucked in