I've used Chinchex pesticide before, its a powder with natural ingredients. You can use it even if you have kids or pets at home, its no harm to your health at all. You can check out how to use it on their website chinchex.sg its cheap but very effective, only took me 2 weeks to solve the problem. I only used my old make up brush and get a pair of gloves to protect my hand from dryness. I think its very convenient. You can get them online from their web and also I think they have it on amazon now.
https://www.amazon.sg/Chinchex-Bed-b...gateway&sr=8-1