Thank you for your quick reply.
Sorry for being long winded.
I'm going for a multi approach except for squishing it under my shoes as @Roberta suggests
as soon as I'm convinced the "snail trail glitter" actually is caused by a snail. This morning I'm doubting it's from a snail or not.
This is how I received this plant by mail. No protection or what ever in a very tall box. Also extremely dehydrated. (Got a refund.)
As you can see the flower and spike suffered a lot of damage. The trail I meant to see might have been sap from the plant. Flower probably (highly likely) damaged during transportation and maybe not by a snail. What I think is a snail trail might be just sap from a bruised plant.
I could salvage the bent spike by taping it and the new bud still is developing. So far so good with that spike. Taping works for Phalaenopsis and for Hoya, it was worth a try.
But to treat spider mites I cut the flower it came with, and now almost a day later I see that same "snail trail glitter" on the spike, just below were I cut that flower and above the new bud. Not elsewhere on the plant.
A snail can't crawl upwards the spike without leaving a trail, thus if it's a snail trail I'm seeing on the top of the flower stem, it must hide around the new bud. And there isn't damage at all. Or the damage is inside the developing bud.
Conclusion. This could be glitter from a bruised plant only or from a bruised plant
and from a snail.
There are still tiny bits of "glitter" on the substrate but that could be the remains from before hosing down that plant.
So for now a reserved approach. I feel that's justified at this moment. But I'll keep this plant isolated and observe, also for spider mite webbing, and treat accordingly.
Currently it's hard to make a decent picture from the "glitter" as we have a lot of overcast. I'll give it a try with sunny weather.