Ya know... there may be a good bit of truth in those words.
No soil. No home for the buggins. I do vacuum (hoovering... for those across the pond) somewhat regularly trying to remove any bug homes.
I treat with neem. It works by being ingested by the buggins first, so a bug flies in, finds no soil to build a house, takes a nibble of a leaf, then dies off.
On a somewhat related note, I've discovered another awesome use for pyretherin. I believe I previously spoke of the shit-bird tenant that left in the night leaving me on the hook for a few utility bills and a bunch of missing rent. Well, they left the apartment damaged and disgusting (of course!) with what appeared to be maple syrup residue all over the kitchen. In the deep south, this is an equation for instant cockroach action... and yes, they were visiting pretty hard around the sink and dishwasher (OMG you shoulda seen inside there!) area. A bug chaser friend of mine gave me some words... he said any of the "-retherin" bug sprays would be effective.
I sprayed my pyretherin spray all in and around the kitchen sink and dishwasher area... next day, nothin!
Gotta pick up some more cans of pyretherin.... sure comes in handy 'round the house.