We used spirits alot when conventional angling in the Cape especially when the wind blew.
I have a method I call the "S-Method". I take the base line of the trace 10cm above the feed ball and hold it tight. I twist the feedball to spin the line thight and when it spins back i hold the bottle of spirits over the feedball and soak it with spirits. Because the spirits disperses so well through the water this is a great caller and caught me lots of fish when the action died down.
I mixed a bit of food colouring into the spirits so other anglers couldn't see it's spirits. I also had another spirits that I mixed syrup in to give a thicker consistency and also flourosciene.
We have also fished with dettol pips, windolene and even petrol pips. All of them caught fish. Because the products are so miscible in water and you use low quantities they simply dilute into the water with no negative impact on the environment.