The process, which takes more than two weeks, involves an estimated 500 paid staff alone picking litter, and several more doing other jobs across the 600-acre site.
Last year's figures estimated 48 per cent of the waste generated was recycled, in keeping with Michael Eavis' "Love the Farm, Leave no Trace" policy.
About 150,000 people are at the festival at any one time and are expected to leave behind 54 tons of cans and plastic bottles, 9.12 tons of glass and 11.2 tons of discarded tents. There are also 193 tons of "compostable material".
There are 66.77 tons of scrap metal, 0.25 tons of plastic sheeting, 41.76 tons of cardboard, 10 tons of dense plastics and 400 tons of wood.
Andy Willcott, who oversees the cleansing operation, said today: "It's the same as always. We are trying to return it back to being a farm again.
"The priority is not sending waste to landfill and recycling as much as we can. The majority of waste is removed after the festival.
"We have a few volunteers but a lot of paid staff. The vast bulk will be gone in the first week. It will then be a finer and finer litter pick.
"As the grass grows back more things will surface - mainly things like bits of paper from trampled paper cups. It will be looking a lot better after two weeks."
A group of stewards known as the Green Police were employed during the festival to try to stop people "peeing" on the ground and upsetting the water table.
But inevitably several revellers managed to go undetected.
The festival website instructs: "Use the toilets provided - don't pee just anywhere, the ground really can't take it. Remember there are 150,000 people at the Festival and all that urine goes straight into the water table and into rivers and streams for miles around.
"It isn't good for the ground and it isn't good for the fish! If you are caught peeing you run the risk of being expelled from the Festival, or at least being very publicly ridiculed by the Green Police! There will be more toilets than ever and they will be a lot cleaner too."
Smokers are also encouraged to use "butt bins" as one cigarette can contaminate up to eight litres of water.
I passed the site last night on the way to a barbie at a mates house and there's hundreds, if not thousands, of tents still sitting there!