About this deal
Assuming the two are the same thing I Yellow Sulpur can be bought from Tamar Organics, Organic Gardening Catalogue and Suffolk Herbs so I would think it would be quite widely available.
I didn't use Jeyes in the end but I will be going down there this morning just to check that my organic natural disinfectant (no idea whats in it) hasnt had the same effect. I don't want to have to wash down all the framework (its a wooden greenhouse)with disinfectant and even then I wouldn't be able to get into the cracks. If you had something like botrytis affecting a well-used one I suppose it would provide a bit more peace of mind. Although I have used a sulphur candle in the past , since having had cancer , I,m now very wary of this and slug pellets , chemicals and garden potions in general really .Every year about now I clear all the stuff out of my greenhouse, sweep it out and give the glass a good clean inside and out. Wear a respirator and lab safety goggles when working with flowers of sulfur and when lighting the candle. No chemicals either, most of the time I am growing things year round anyway and don't want chemicals and after many years of not disinfecting my greenhouses, the growth hasn't stopped, there have been no horrors and I get hardly any blight (just a bit at the end of the season in November or December, together with grey mold.
It is good practice to check in the shed on a regular basis to ensure such products are disposed of safely.
A couple of years ago I disinfected with Jeyes and failed to rinse sufficiently; a few days later all the framework was covered with a white powdery efflorescence - after I had refilled the greenhouse with pots and seed trays of course!