He filled a bucket with hot, soapy water and found a big brush with a telescopic handle (that means the handle can be made longer and longer) so he could reach to the top of the glass whilst he was still standing on the floor. No need for ladders (he's not really very good with heights)!
He quickly washed down all the glass outside whilst the other bears (and some friends) emptied everything out of the greenhouse itself. Phew! That was very tiring!
In the meantime, Scary had put on his rubber gloves and, using a scrubbing brush and another bucket of soapy water, cleaned out all the plant pots they had used in the greenhouse last year.