Is the product breaded then refrigerated first then fried? One way to clean fryer on the fly is break a fresh egg into it shell and oil . The egg sinks starts to congele and captures a load of crumbs and debre into it and then you take it out when it comes to top with a spider. Wont get it all out, but it helps. Other way cut a peice of METALl fine mesh SCREENING the size of bottom of fryer ,attach wire peices to the four corners and pull it out every once in a while. This will also remove some of the junk. Good Luck Only other thing that will work is a self filtering fryer.
Over 50 years in food service business 35 as Ex Chef. Specializing in Volume upscale Catering both on and off premise .(former Exec. Chef in the largest on premise caterer in US with 17 Million Dollars per year annual volume).
Well versed in all facets of Continental Cuisine...
The comment was made about pre-breading the calamari. Obviously this is not your way but if you were to consider that option you may find less crumb in the oil. The refrigeration does help make the crumb stick better. Since you sell so many orders it may work.