Orvus Paste is for real and is used for washing quilts. The same product is sold as a farm supply for washing horses.
New quilts are tougher than you may think.
I wash my quilts in the washing machine.
Fill with cold/tepid water and a Tbsp of Orvus.
Submerge quilt.
Agitate a few minutes. Let it soak about 15 more minutes, agitate a couple more minutes and then spin.
As the rinse water fills I add a bit of fabric softener, agitate a few minutes, soak, agitate a couple more minutes and then spin.
I also dry in the dryer on low heat until the quilt is almost dry, then spread it out flat to finish drying.
If you prewashed the fabrics used in making the quilt, there should be no shrinkage.
For older quilts, line the bathtub with a sheet, then the quilt. Add cool water and Orvus. Swish about by hand, soak, drain, rinse and then roll the sheet and quilt and press out as much water as you can.
Lift out of the tub buy holding onto the sheet so there is no stress to the quilt.
Lay flat to dry.