Id pop into your vets for a kitten worming tablet and some houseflea spray- the johnsons and/or bob martin stuff is rubbish with the exception of the 4fleas tablets which are the same ingredients as capstar. they just dont kill the little butter. R.I.P. fleas,indorex etc although more expensive per can, last longer and actually do kill fleas
are your other cats treated for fleas? do they go out?
Vacuming and washing bedding is deffinitely a good plan. As far as i know a hot wash kills the beasties
ive not heard of lemons having any afect on fleas. i cant imagine how they would?