The optimistic and inept Timothy Lea is freshly employed by his brother-in-law Sid as a window cleaner. With Sid an impending father to be, he looks to Timmy to fully 'satisfy' his customers, little realising that Timmy's accident prone ways often stretch to his sex life with his clients. Timmy bed hops from unsatisfied housewives to even a lesbian love tryst, all the while with his main eye on successful police officer, Elizabeth Radlett, who will have none of Timmy's sexual advances. He proposes as a result, much to his family's upset, unaware that Timmy's usual run of luck will affect the outcome.