The following procedure is to be done by adults only! I've removed & reinstalled many decals on Playmobil projects due to my perfectionist personality because I can't stand to see them misplaced, uneven, crooked, or with debris under them, etc.! Depending on the decal there are several procedures I use. CAUTION! Before attempting any procedures, be sure to wash your hands to prevent any additional contamination to the decals being worked with! 1. Is using a sewing needle, I try to lift a corner of the installed decal & once a tiny section lets go, I lay the needle parallel to the panel sliding it under the entire length of the existing decal. I release approximately1/4" of the decals edge or enough to use my fingers to pinch the decal & pull it at a 45% backward angle slowly until it becomes removed. I then put the the decal in a protective storage container to protect it from dust, fuzzy buddies, pet hair, etc. until I'm ready to reinstall it! I use 3M general adhesive remover part number 08984 or equivalent to remove any adhesive residue left behind on the plastic vehicle or part. The 3M cleaner will not harm Playmobil vehicles plastic that I've used it on. DONOT let any decals come in to contact with any adhesive remover due to irreversible damage resulting to the decal such as melting, fading, adhesive softening too much, etc.. After cleaning the plastic surfaces & prepping them for decal installment I use a shallow soup bowl with a 1" diameter spot of DAWN dish washing soap mixed in well. Submerse the decal to be installed, or reinstalled into the soapy water, & if the decal has been previously installed & you notice debris under it, you can gently rub the decal for a few seconds to remove the dirt, or debris & then it will be ready for reinstallation. With the decal coated in the soapy water lift it out of the bowl & properly place the decal on to the prepped clean plastic surface. While the surface is wet with the soapy water you can properly align & place the decal into position. Once the decal is correctly in position, use a linen handkerchief to smooth any bubbles & soapy water from beneath the installed decal starting from the center of the decal & working toward the outer edge 1 side at a time. If the decal does not want to lay flat use a hair dryer set on warm to soften the decal & make it conform to the surface using the linen cloth to persuade it into adhesion. Be sure to press on one edge of the decal after warming it & to keep it from sliding out of position while smoothing it. Here's a tip; If a corner of a decal is not able to be released from the plastic surface, try warming it gently with a hair dryer to make it pliable. Take caution that you DONOT over heat the decal which will cause it to become stretched or deformed. Let the decal cool down once you get an edge released before pulling or proceding any further.