Prewashed brands of Iceberg Garden Salad and Coleslaw that normally bear O/K certification, such as Dole, Kroger brand and Marketside (Walmart), currently do not bear the O/K symbol on many bags. Even the same store may have a mixture of some bags with the O/K and some without. This is due to increased infestation levels in some batches. Little Salad Bar brand at Aldi currently does bear the O/K symbol, but this may change at some point. Check every bag for the Kashrus symbol.
From The KIB: Pesach News – Avocado Oil and Spray
All Pure Virgin Avocado Oil & Spray (without additives), are fine for use on Pesach without a special Pesach designation on the label.