Toddler Putting Things in Mouth

I am seriously at my wits end. My 32 month old is still putting everything in his mouth. I do not remember my others being this bad at this age, and this is not just me forgetting as I had twins and remember thinking when they were 18 months that they were bad (we had outside cats poisoned and I was paranoid the boys would get into whatever the cats had gotten into), but it wasn't long after that I noticed it was no longer a problem, and it was never this bad, but this child is horrible at putting everything in his mouth and it is getting more dangerous as he now climbs. I do not have enough places high enough to keep him out of things. He eats lotion, diaper rash cream, soap, chapstick, and toothpaste. I have to keep some of that low enough so my other kids can use them, but then fight him to not eat it. Now, that we are outside he attempts to put my flowers in his mouth which I know can be bad. I do not know how many times I have called poison control for the possibility of him getting into cleaners, to the point now that I only use vinegar and water just to be safe. He does this all in a flash too. I may be doing dishes while he is in the room and someone may have left a bottle of cleaner, or desitin out, and when you turn around from the dishes to wipe the table you find him doing it right there with you, or you go to the bathroom and find he climbed something to get to something you placed up high to keep him out. Or, I left the room to switch a load out of the washer to dryer and reload the washer and found he had gotten on the counter to where my purse was and dug out the extra strength tylenol and I know he had tried it because I found a half dissolved one, but I could not be sure how many he may have taken if any. So that was a 6 hour trip to the ER for a blood test that thankfully showed no traces of it in his system. Now tonight, we were at my parents 4 adults and 4 kids in their living room talking, kids were playing and the 2 year old comes up to me trying to get something white out of his mouth. He had never left the room, and the only thing that might have been in there was either lotion or chapstick and neither could have been what I was getting out of his mouth. He had not left the room. We finally came up with the idea that it could have been leftover Resolve carpet granules that got missed with the vaccuum, but even still we are not certain. How do I know some of the medications my parents take didn't get dropped. Though they say they do not take their pills in the living room so it isn't possible, but I can't say that I am comfortable with that. Another call to poison control who says that is should not hurt him if that is what he had in his mouth and it isnt like he had a lot, but I still worry. I feel like this is pretty excessive if he can do it right in front of us, and this doesn't touch upon the things he puts in his mouth that he could choke on. My house is pretty safe, and each night my husband and I both do a quick check to make sure if he wakes before us he cant get into anything, but one day I caught him with a metal sliver from our screen door that is needing replaced as it is rotting, but we cannot afford to replace it right now. He tore the piece off the door and was chewing on it. As unsafe at that sounds on its own, how do I know if it has lead in it? I feel like it is excessive for his age. I do not feel like it should be this extreme at this age. I can see dropping food and thinking it is still okay to eat. My 7 year old still does that when she thinks I am not looking, I can see putting some toys in the mouth to an extent, but eating non-food items that he has been around and knows is not food??? I would really like to break this but apparently constantly reminding him to not put things in his mouth isnt enough. Putting him in time out doesnt seem like an option while I am calling poison control or needing to observe him. I have tried talking to him about how bad it is when he does this, I have tapped him on the mouth while being stern with him (this stopped him from biting). I have tried making a big deal out of it, not making any deal of it. i would LOVE suggestions on how to curb this behavior. I do try to keep these things out of his reach, but I can't control every situation, just like the situation at my parents while I was right there in the room with him. I just had no idea anything was there. Any suggestions would be greatly appreciated on how to make this phase pass quicker.