So I went out to buy some groceries

[loramin]

It's not all hoarding. Before Covid you had dishwasher soap produced for businesses, and you had residential soap. Regular people used a lot of the former (indirectly), by eating at restaurants, cafeterias, etc.

Now though there are far, far less people are eating away from home, which means all that soap isn't being used. Instead, they're doing way more dishes at home than they normally would, using way more residential soap. Toilet paper and similar goods have the same core issue.

As a result, there's far more demand for residential soap than there was before, and while companies are trying to scale up to meet that demand (and scale down commercial soap production at the same time) ... changing stuff like that takes time.