I bought a used Breville bov800xl that is very dirty. Can spray oven cleaner be used to clean it?

There doesn't appear to be a Service manual, but you can get parts.

https://www.google.com/search?q=breville+bov800xl+%22service+manual%22

https://www.ereplacementparts.com/breville-bov800xl-smart-oven-parts-c-116052_116061_116092.html

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the lower elements are separate to the others and so can be replaced if burnt out
re may be a pdf version of a mnaual for the unit if you go on line to google and type in breville convention oven model bov800 xl/a manuals
scroll the pages until you see a pdf version listed

You can use Easy Off 'Fume Free' oven cleaner on a self-cleaning oven, if you want to manually clean it, but do not use it with the self-cleaning cycle.

Hi, W/D here.
Ovens just love for you to use the self cleaning feature on them. This gives them all kinds of excuses to lock up, fail components and have other components become "unpredictable". Self cleaning takes the oven to extremely high temperatures to incinerate the baking residue. This also uses a high amount of energy. My best advice is to clean the oven with the spray cleaner whenever possible, and to avoid the self cleaning feature altogether. Use normal precautions with the spray, following the directions on the can. This will do the job just as well, and takes much less time. Just make sure that the product that you use says "safe for self cleaning ovens", and you'll be fine.
Best regards, --W/D--

Just purchase a good oven cleaner, generally available at most supermarkets, they can be a spray type cleaner, or a gel that you brush on, personally, I prefer the spray on type of cleaner.

Wolf does not recommend use Easy Off, but this is the best cleaner for oven, just don't spray on it, wear gloves, spray on a rag and apply on to the porcelain surfaces, and other good all around cleaner is called Bar keeper's friend and you can pick it up at Safeway or ACE Hardware. Have fun.

If there is an up and down arrow on the control panel, you need to press the clean button first and then choose clean time with the up and down arrow. Be sure to remove the racks, if left in the oven they will be blackened by the extreme heat. Clean them separately with oven cleaner. Place them on newspaper and spray them.

easy off has a new spray for self cleaning ovens start with that after getting loose grime then self clean

spray a little oven cleaner on a wet rag and wipe. Rinse really well afterwards. Do not spray directly in oven. It could get in the holes.