[HOW-TO]Wipe your Android Phone using Clockwork's Recovery - myTouch 3G Slide Android Development

What we have here is a tut on what's required to clean your phone prior to installing a custom rom
Pre Requirements:
1.) must be ROOTED
2.) should have Eng build installed(not a necessity, but makes life A WHOLE LOT EASIER!!)
3.) must have clockwork's recovery installed
remember people, when i say "select" i mean clicking the touchpad.. in the newer versions of clockwork, you can no longer press the power button to select
so here's your steps:
1.) boot into clockwork recovery(easiest way is through rom manager)
2.) scroll down to wipe data/factory reset and select using your optical touchpad
2.1) scroll to yes and select
3.) scroll to wipe cache partition and select using optical touchpad
3.1) scroll to yes and select
4.) scroll down to advanced and select
5.) scroll to wipe dalvik cache and select
5.1) scroll to yes and select
6.) scroll to wipe battery stats and select
6.1) scroll to yes and select
7.) click your back button(right of the touchpad)
8.) scroll to install zip from sdcard and select
9.) scroll to choose zip from sdcard and select
10.) scroll to your selected rom, and click the touchpad
you should now see it starting to load/install the rom. when its done, back out to the main menu if necessary and click reboot and WAIT!!! it will take a few minutes for everything to load up perfectly. once it loads up to the select screen, i would suggest waiting a couple more minutes for everything to load up before actually starting setup
and now you're done! you've wiped your phone, and installed a new rom! congrats!

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thanks for this.
to be clear, is it ok for me to rid myself of these codes:
Code:
adb shell
cd /system/sd/dalvik-cache
rm -r *
cd /system/sd/app-private
rm -r *
exit
Code:
adb shell
wipe data
exit
adb reboot recovery
or was this just the code that the recovery is running instead of manually?

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what those codes do i sthe same thing that wipe commands do that i just described

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Is it necessary for me to wipe every time I flash a new ROM?

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It's the best way to avoid problems.