True .... but it might be time to figure out a liquid combination that stains or is slightly corrosive. You don't need to melt things, just corrosive enough to etch, mar or deform glass or plastics of sensor lenses.

You clean everything up but realize that the liquid has permanently damaged an imaging lens cover, either with deep stains or corrosion.

Then you replace it but then it costs money and time.

And you do it over and over again

We had to to clean and detail courthouse workers' (judges, DA, etc) personal vehicles for community service as children.

I know for a fact one of the cities in my area uses the people who are in the city jail for unpaid fines. They get $50 off their fine... by doing all the labor of the jail, like washing the floor, cooking the food, and yes, washing the cop cars.

Nothing a fan of silly string won't fix.

Also, there's wasp and hornet killer cans that shoot 30+feet. Likely enough sticky liquid in there to bring down a little drone.

The right fire extinguisher will make a cloud of visibility cover....

Plenty of low-tech "solutions".

Balloon or multiple balloons attached to 80lbs fishing line

or conversely, a small hex nut tied to the end of a line fed by a spool of 80lbs fishing line with about 40 feet of line ... then use a slingshot aimed at the drone ... launch several lines until one gets caught

No. You're spending tax payer dollars to send a message that the tax payers didn't want their dollars spent on unmanned police surveillance.