Pre-heat oven to 225°
Combine pretzels, cheerios, chex, peanuts, into a large bowl or if needed to large bowls.
Melt butter in large bowl and add Worcestershire sauce, garlic, onion, and celery salt; mix until combined.
Pour over mixture a little bit at a time, carefully mixing well between additions. I suggest using a flexible spatula to avoid crushing the chex and pretzels.
Transfer mixture to a large roasting pan or two if needed. The tin roasting pans from the store work very well if you do not have a large enough pan.
Place in the oven and reduce heat to 200°. Bake for a total of 2 hours; stirring every fifteen minutes.
When done take out of the oven and let cool completely before bagging.