As others have said, you havent got it all off yet
You need multiple baths of fresh and clean dettol fluid to gradually get it all off. I found this a real pita, and sought a better stripping agent, fairy power spray is the one.
Its available in asda and wilkinsons, so thats most towns covered I would expect. Models dont need to be submerged totally in the power spray, just coated in it, and left for 15min's before scrubbing with a tooth brush, adding water doesnt have the negative effects with power spray that it does with dettol. The smell is no where near as offensive, and the cleaning is faster and easier by far.
Dettol worked 'fine' but it took days, smells rather strongly, leaves said smell on your models for a fair time, and leaves behind annoying sticky residue.
The stickly residue I found comes off easily enough using 'anti static panel wipe & degreaser' something that car sprayers would have for wiping down a panel litertally just before they spray any paints. I had it kicking around because I airbrush things often, I pay roughly £7-8 for a liter of it, and suspect is would strip the paint off mini's by itself if given long enough to soak. Just having a small pot of this, and an old paint brush to scrub the models down with removed the sticky residue and any bits of paint still clinging to the figures left behind from the dettol stripping. With power spray I didnt need this step. Honestly fairy power spray will have you wondering why we ever thought dettol was good