@ballsdeep
This is how you wash 94 children's hands in 6 sinks in 5 mins.
Each child knows that they are in group 1 or group 2. Each child knows which is "their" sink.
When whistle blows, group 1 children, 47 of them, line up 8 to each sink. Group 2 can sit on carpets and sing a hand washing song or similar.
The 47 children in their lines of 8 to a sink. First child in each line wets hands and puts on the liquid soap or rubs hands on bar soap. They then go to the back of the line with hands still soapy and begin rubbing the soap in. Second child gets soap on, moves to back of line, etc.
By the time child number 1 gets back to the front of their line, they have been rubbing soap in for more than 20 seconds and the second time they get to the sink they just need to rinse their hands off quickly. And so on for child 2. They then go off to their carpet or back to back of line as you wish, with a paper towel. Staff member has bin bag holding it open and children drop their towels in as they pass on their way to the carpet.
Group 1 now do their song, group 2 do the hand wash conga.
Transformed things as DC's school.