I have a powerful Amcor ioniser which I bought in the 80s when living in Beckenham. I lent it to my Mother who smoked, and within a month there was 'marmite' dripping down the walls behind it. Yuch.

Yesterday I bought a S/H Kirby vacuum cleaner, very expensive when new, but as good as a Dyson, (which I think overrated and cheaply built), and will last a life time, the Dyson about 3 years.