Can substitute a forward slash for the 0 and remove the quotes

   printf \\33c

Another way is to use a program that converts hex to binary. A short script to use when there is no clear, tput, etc, e.g., xxd or nc-data

   exec echo 1b63 |exec xxd -p -r

   echo -e '27\n99\n' |exec nc-data -g

   exec echo |exec sed '1i\
   27 \
   99 

   ' |exec nc-data -g

\ is a backslash

/ is a forward slash, a.k.a. simply “slash”

Not sure why I always get this wrong. Maybe it is because when I draw these characters on a surface, I start from the top not the bottom. Hence the line goes forward for a "backslash" and backward for a "forward slash". What is the etymology of these terms?

Probably better to just use "escape" for backslash and "slash" for forward slash.

As I said elsewhere in this discussion, use DECSTR instead of RIS unless you really need all of the things that RIS does to actual terminals, like performing selftests and resetting the serial connection. Habitual use of RIS is a bad habit to get into.

On iTerm, that clears everything visible on the screen, but not the scroll history.

Sounds like your terminal clears everything? vt100 variants are a, uh, delightful mix of nearly-compatible dialects...