Not sure if all Dysons have this instruction. Mine is an animal ball dc39 I think.
When I bought it, there was an instruction to say that the filter sponge in the centre of the cylinder bit should be taken out and rinsed under running water once a month.
Now I'm not house proud and I probably only hoover about once a month on average. So I assumed that the once a month probably applied if you were using the hoover a few times a week and that once a year would be fine for my slovenly habits.
So a year on, I have dutifully taken it out and rinsed it but 2 days later the bugger still feels really wet - it will be days before it's dry.
Do you bother? And if you're the kind of person who likes to hoover every day, do you therefore just live without hoovering for a week each month?