Doodles on the Heating plus A/C system

I love our son really much, but the way he finds a way to entertain himself is really concerning, and i suppose he is picking his antics up on our cat, who also likes to get in trouble, plus I suppose they are now teaming up, and the cat destroys the toilet paper plus our son follows suit, but recently, drawing has become his modern thing, he started drawing on paper which was really nice, however I guess he got bored with paper plus then moved to start doodling on the walls.

I scolded him plus told him only to draw on the paper, plus I even bought him his own drawing book, but unfortunately for me, he seemed less than interested in it.

He tried for a little while drawing on the walls behind our back, but his drawings were really obvious. He eventually stopped, or so I thought, then eventually when taking out the trash, I happened to glance over plus notice our heating plus cooling idea had bright colors scribbled all over it; My gas furnace plus a/c were jammed in the corner of our garage plus mostly out of sight, so it can be taxing to spot, but upon closer inspection, it had marker scribbles all over it. I instantly brought our son out plus scolded him again, I sent him to his room plus took away all of his markers. I then took a wet cloth plus thankfully the scribbles came out nicely, plus the Heating plus A/C unit looked almost brand new. I kept our garage locked for a while I was in case our son tried to go back plus do who knows what to the Heating plus A/C system, but thankfully he seems to have forgotten about it.

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