Okla. Stat. tit. 15, § 15-235: Duty of party attempting rescission

Rescission, when not effected by consent, can be accomplished

only by the use, on the part of the party rescinding, of reasonable

diligence to comply with the following rules:

1. He must rescind promptly, upon discovering the facts which

entitle him to rescind, if he is free from duress, menace, undue

influence, or disability, and is aware of his right to rescind; and,

2. He must restore to the other party everything of value which he

has received from him under the contract; or must offer to restore

the same, upon condition that such party shall do likewise, unless

the latter is unable, or positively refuses to do so.