I like gooseberries just fine as long as sugar is also involved. What time should I come? I knew that about the preservative charms but you know what, she SHOULD have told you. The Strettons have SIGNS UP all over in their store rooms, telling you what charms you shouldn't use where, because it's a bit complicated and they don't expect people to just know.

Because yeah if you're not supposed to use THE MOST COMMON CLEANING CHARM THERE IS people ought to let you know before they SEND YOU TO CLEAN A ROOM.

(The Strettons mostly deal with this by having some of the muggles clean the store rooms. You know who can't ever upset an anti-maggot ward? Muggles, because they don't have wands.)