Good Morning , this is my first post here so sorry if I start off with a 'rambling' post 
Our son is 7 and has ASD, GDD, ADHD and SPD. He is also non verbal.
He began to start spitting around a year ago , which at the time we thought may be a current 'phase' of behaviours which has happened in the past. However he went from randomly spitting whilst stimming (not directed at anything), to now spitting pretty much constantly. This is at us, our other 4 year old son, and all of the teachers at school. Its is also all over the furniture/windows/floor.
He has never been a particularly aggressive natured boy, but he can lash out a lot at me now.
We are have been working with CAHMS (limited of course!) , but nobody seems to be able to offer many suggestions. They have stated we need to work out the triggers. However he does it when stimming and quite happy, he does is when he's angry and can't get something , and he also does it when he is trying to get a reaction from you or get something he wants. So basically all scenarios. We have tried ignoring him and he will continue & continue as he wants a reaction. We have tried reacting and removing him from the room into his own room so he can no longer try and get that reaction.
The difficulty being we cannot distract him with anything as he literally has zero interest in anything other than moving or spitting. And because of his GDD his understanding is very little.
We have a sea of sensory chews in different textures that we direct him too incase he is spitting as a sensory thing. We also provide regular snack breaks with something liked celery/cucumber. And also dry things like rice cakes and breadsticks.
I Spend my life cleaning up spit from the walls/windows/us. We are unable to take Oliver out anywhere as its obviously socially unacceptable to be spitting at others.
Combined with little sleep as he wakes so ridiculously early we are struggling at the moment.
Any advice from anybody would be much appreciated. Thank you
