I don’t know if there’s a general rule for when to omit "to" before a verb that normally requires it. In my native language, the verbs in bold in the example below would all be in infinitive (to + root form of the verb, e.g. "to wash") so it often confuses me, but if this logic of mine is correct, it'll help a lot.
I think that in the following case "to" can be omitted, because there are implicit elements (between brackets) to consider:
If I could, I would do all that is still undone: [I would] wash the floor, [I would] do the laundry, [I would] clean the windows, and finally [I would] prepare the dish.
Is this logic correct? Thanks in advance.