I would not be so certain that rinsing will do the trick. That decor sounds like it has places for things to accumlate in nooks and crannies and even internally, that might not rinse out easily.
When the disaster happened did you notice anything floating on the surface of the water when you discovered the problem? Normally, soap or lotion will cause film on the water surface. If you are uncertain about this, get a clean container, rub some of the hand lotion on a finger or two and then swish them arount in th water and see what happens. If you see evidence on the water surface, I would suggest you do the following.
Rinse something likley to harbor things from this incident really well and let it dry. Once it has, fill a clean bucket with clean water and place the item in the bucket. If you have something the will move the water around in the bucket, use it. If not swish what ever is in the bucket around int the water now and then over a few hours. if there is still stuff coming off of/out of the object, you should see it on the surface of the water.
With substrate it gets harder to clean. The more you try to rinse at one time, the harder it is to do so effectively. I would use the bucket method and stir up the substrate a bunch. Use the same process to rinse it well as you would for new substrate before you put it into a tank.
Bear in mind that things which are difficult to rinse off can still come off of things continuously submerged as they would be in a tank. So the bucket test does not guarantee safety. But it will give you some idea.
Anything organic will be trashed by bleach. A strong solution can pretty much dissolve anything. But I cannot say it will work on hand lotion.
Finally. the hardest thing to get clean after an incident of contamination is real wood. It absorbs water and whatever is in that water, getting some things out of the wood can be almost impossible.
My experience is anything "oily" means it is hard to get off. I throw such contaminated items away. Glass is a bit easier to clean so you can probably salvage it. But again I suggest you get visual evidence after cleaning it that when filled with water it stays clean.