I find that any grease will attract dirt, by it's very nature, if there is dirt in the vicinity if you see what I mean. I use silicone grease primarily as a lubricant to resist binding, reduce friction and help materials like silicone and nitrile rubber seal without twisting or turning. It is also inert when it comes to these newer materials and used in a potable setting.
What materials do you want to lubricate, is it seals or is it on metals to reduce binding and excessive wear?
I have 3 different tubs actually with one being dielectric, just acquire them and use whatever I have to hand - Arctic Hayes is my usual though as that's what my supplier had in stock, never failed me yet on whatever I use it on and it still seems to be there when I return to the job. Typical examples of where I use it are mag filter tops and pump seals/valves - others would be compression waste pipe seals, any O-rings I happen to come across in boiler/flues/fittings/valves etc, pushfit couplers, compression tap valve worms etc.
The only part of a zone valve that should get sticky is where the shaft seals meet the shaft housing and by that point the seals are goosed and it will need replaced.