Dyson DC41, DC43, DC65 or DC66 - Removing a blockage from the wand or hose

yes you can wash the filter the link below is the manual for the DC41 which is the same as DC65
http://manchestervacs.co.uk/Dyson-Instruction-Manuals/DC41_Instruction_Manual.pdf

Dyson DC41 DC41 Mk2 DC43 DC55 DC65 DC66 Getting started Official Dyson...


Dyson DC66 Cinetic Big Ball Upright Vacuum Parts


DYSON OWNERS MANUAL DC65 DC66

The user manual for the Dyson is only 9 pages. I cannot access one for the D66 for free. From the ad above, the manual for the DC65 must be similar. There is also a uTube around which addresses unclogging hoses for dysons. The first link above hopefully shows you about the accessories, anyway.

Ouch The video below shows how to to remove the brush head and how to clean it. I almost think that Dyson didn't ever expect this belt to break. The rest of the disassembly to get to the brush seems to be done by removing torx screws, I have not been able to find a replacement from dyson. A google search shows several sites that sell a replacement belt.
Dyson DC41 DC43 Resetting the brush bar Official Dyson video
Link to sears parts direct has a diagram of the brush head.
DYSON INC Vacuum Parts Model DC41 2013
Link to Dyson Parts with phone number for customer care.
Variant Parts