Vulcan steamer

I have a Vulcan steamer and I am looking to descale the unit as preventive maintenance measure. I cannot just buy the descaler through the company. Does any one have any ideas what I can use as as suitable substitute to descale my steamer?

We use deliming powder from United Refrigeration or you can order it from FMP.

We use cleveland descaler it works good

I will add on thing...........I trashed two new Vulcan boilers before switching to soft water feeds...........

Any delimer works good.