Your strength is in writing OP, and all the things you have said on this thread about the actual practical things you do for your dc.
Those things you need to write down and circulate by letter/email (with acknowledgment of delivery, like proof of posting or email notifications)
Confirm in writing all the things you have done to keep your dc safe, clean and loved.
I know someone who left her baby to cry relentlessly whilst she tidied and cleared her house, I went in to cuddle the baby, I just couldn't bear it! I'd assumed she was struggling or something had happened,but no, a few weeks old the baby was in the middle of the floor (on an activity mat) crying, sobbing and she explained she'd got to finish her cleaning up! Immediately I picked up the baby she started to settled. Her older DC didn't walk, or talk at two +
Whenever I'd seen the older toddler she'd been sat in a buggy/on floor with a phone in her hand playing on a game or watching YouTube videos.
I didn't see any signs of interaction. They all looked extremely clean and tidy
and well fed.
She also had an abusive ex.
Without hearing the actual written testimonies, by stating the simple things, like how often you bath, how much you enjoy your interactions with them, frequent trips to the park, etc, lovingly tucking them in at night, fun at bathtime, and that you have moved away from the abusive ex and he's subsequently lost interest. I also know someone in a similar place to you wrt being under scrutiny for removal of dc, her ex has been to her home where the dc are and shes been beaten again (after fleeing - she's terrified of her ex and terrified of ss taking her dc).
I also know of cases where dc and dms are reported by abusive ex's and SS don't seem to be explicit about claims made against the dm by third parties, and are not allowed to reveal 'data protected' as in reports submitted by third parties.
Contact Family Rights Group, who exist specifically to support families dealing with SS, to ensure you have someone present at every meeting, that you are meeting basic levels of parenting, and that every word said is minuted and challenged if incorrect.
They exist exactly for your situation because so many families have had dc removed without good cause, and yet others have dc die because of dangerous perpetrators.
They know how to deal with SS and will guide you to ensure all is documented and challenged.
AFAIK its free/charity.
If you have an abusive ex, anything is possible sadly. Manipulative perps are believed over women often, and vexatious reporting is a common tactic of a perp.
There is also a charity that run a support service for women without their dc. I'll try to find a number and link for you.
Your writingnis your strength, set out your challengss to all they claim with the practical ways which knock down their claims, each and every one. Just like you have said on here, i.e. you require to see actual written reports of dirty dc signed and dated by the person making this claim.
Request in writing any evidence they have for their claims, and knock them down one by one.
The problem is their meetings, undocumented. They can say and assert anything they want and remain unaccountable. You need copies of any minutes and then you can set about refuting them with all the written evidence you have put here on your thread. Family Rights Group will guide you also with this.