I much more reliable indicator of tube health is how hot they’re biased. Tubes biased close to the crossover can last a loooong time.

Dust is like 50% skin and hair and 50% other biological stuff from plants and clothes fibres and stuff. Nothing you can buy can get rid of dust (other than a cleaning company).

Get rid of carpets and any other surface that has a cloth covering. Replace your cloth covered sofa with a (fake-) leather sofa. These absorb dust, then release it when you sit down. “

Dust horizontal surface regularly (weekly). Keep horizontal surfaces clear of stuff (so you can easily and quickly dust them. Dust your bed regularly.

Always keep your clothes in cupboards draws and always keep the doors closed.