"Just caught her! She says she'll get the Cleansweep if she can."
-- Ron Weasley (OP9)
The Ollerton brothers produced large numbers of Cleansweeps aimed specifically at the racing and Quidditch markets. Models released by the company include: Cleansweep 1, Cleansweep 2, Cleansweep 3, Cleansweep 5, Cleansweep 6, Cleansweep 7 and Cleansweep 11 (QA9, CS7, OP9).
The Cleansweep series are known for their ability to turn corners quickly and efficiently (QA9).
In popular use, a "clean sweep" is a complete win over the opposition - sweeping the board clean.
Lexicon list of Broom Manufacturers
Although the dates printed on the Daily Prophet Newsletters are:
the timeframe for these events is 1992-1993.
From the Web
Harry Potter Wiki: