I remember a trick from How Clean Is Your House and it's now the first thing I try. Put a little bit of WD40 or 3-in-1 oil onto the sticky residue and rub it in with a dry cloth (an old duster or something). The oil will dissolve the glue, just wash in washing up liquid afterwards to clean off any leftover oil. Obviously, this only works on non-porous things, but Lego will be fine.
I remember a trick from How Clean Is Your House and it's now the first thing I try. Put a little bit of WD40 or 3-in-1 oil onto the sticky residue and rub it in with a dry cloth (an old duster or something). The oil will dissolve the glue, just wash in washing up liquid afterwards to clean off any leftover oil. Obviously, this only works on non-porous things, but Lego will be fine.
