An old homemade insecticide will do the grounds but don't use it on people or animals.
Soak a large jam tin full of cigarette butts in water overnight,
Drain off the liquid into a 20 litre bucket
add a couple of table spoons of hot chilli powder
and a couple of caps of liquid dishwashing detergent.
Fill the bucket with water and stir,
Apply to lawns, gardens and ground with a watering can.
(Keep agitatng it to keep the chilli in suspension.)
It will get rid of the fleas and all other insects.
Don't get it in your eyes and wash your hands throughly after use.
(p.s. tobacco was widely used as an insecticide before DDT was invented)
The first time I used it on my garden there was a large cloud of insects escaping from the tomatoes.
