Treating white fly on tomatoes
If the Bug clear spray is fatty acid based then you could continue to use until you introduce the Encarsia. If it isn't fatty acid based then give Savona a go. Once the Encarsia are introduced you can continue to use, only if you are spraying the heads of the tomato plants, as the Encarsia work lower down the plant. If the Bug clear contains a chemical insecticide ingredient, you will have to stop all sprays a.s.a.p, as the residues and vapour action could harm the Encarsia. Check the label of the Bug Clear for the ingredients.
Hope this helps.