How used totes are commonly graded
There is no single industry-wide grading standard, so definitions vary by supplier. Typical categories look like this:
Food grade. Previous contents documented as food-only (corn syrup, glycerin, fruit purees, food ethanol, etc.), cleaned with a multi-stage hot wash and potable rinse. Ask the supplier what documentation comes with the tote.
Washed (industrial). Hot caustic or detergent wash plus rinse. Often used for industrial chemistries, lubricants, coolants, agricultural fluids and surfactants.
Rinsed. Water rinse and drain. Usually suited to non-contact uses: rainwater harvesting, secondary containment, garden beds and repurposing.
When you request a quote, say what you will put in the tote. Suppliers can then tell you which grade they'd recommend and what they have.