How do I remove spaces or special characters within a cell for large amounts of data

Question

Is there any shortcut to remove spaces between words and numbers within a cell?
Example:
Current: .5 lt PET (6)
Need: .5ltPET(6)
Is there any shortcut to remove special characters between numbers within a cell?
Example:
Current: 0--000--000--0
Need: 00000000

Answer 1

Thanks Wayne.
I have been away from using Numbers or Excel for 4-5 years so it is slowly coming back to me. I am get that I need to use the SUBSTITUTE function however I am having trouble with getting it to work.
My Data
ST PAULI 12/12 NR
$27.16
12oz NR(12)
0--80660--95937--5
ST PAULI 4/6/12 NR
$28.76
12oz NR(6)
0--80660--95935--1
ST PAULI DK 12/12 NR
$0.00
12oz NR(12)
0--000--000--0
ST PAULI DK 4/6/12 NR
$28.76
12oz NR(6)
0--80660--95945--0
ST PAULI N/A 4/6/12 NR
$20.66
12oz NR(6)
0--80660--95955--9
CAYMAN JACK 4/6/12 NR
$29.12
12oz NR(6)
8--15829--01006--8
CAYMAN JACK 8OZ/12PK CAN
$23.18
8oz CAN(12)
8--15829--01061--7
TGIF LIIT 10OZ FROZEN POUCH
$35.80
10oz POUCH(24)
8--15829--01043--3
TGIF MARGARITA 10OZ FROZEN POUCH
$35.80
10oz POUCH(24)
8--15829--01047--1
TGIF PINA COLADA 10OZ FROZEN POUCH
$35.80
10oz POUCH(24)
8--15829--01045--7
TGIF STRAWBERRY 10OZ FROZEN POUCH
$35.80
10oz POUCH(24)
8--15829--01042--6
BALLAST PT BIG EYE IPA 1/2 BBL
$190.00
KEG 1984oz (1/2 KEG)
0--000--000--0
BALLAST PT BIG EYE IPA 1/6 BBL
$73.00
KEG 660.1oz (1/6 KEG)
0--000--000--0
BALLAST PT BIG EYE IPA 4/6/12 CAN
$33.00
12oz CAN(6)
6--72438--00052--7
There are many more but this is enough to show you. I need to remove all spaces from the First and Third Columns. I need to remove all (--) from the fourth. Where do I put in the substitute function and what is source sting, existing-string, new-string, and occurrence.
Thank You for your help.