Hi Mary,
The filters in your DC33 should be washed at least once every 3 months, using cold water without detergent. Allow them to dry somewhere warm for at least 24 hours before replacing in the machine. Please follow the steps shown in our online Support guide for assistance:
http://www.dyson.com/support/help.asp?article=1415&product=DC33-MULTIFLOOR
I hope this helps - if you'd like any further assistance or advice, please call us on 0800 298 0298 (UK), or 1-866-693-9766 (US).
Best wishes,
Jack
Dyson Online Customer Support
http://www.dyson.com
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