Problem when uninstall direct from msi location path & in for loop - arrays

Question

I try to uninstall a msi file, but when I try this via array I get an error (cant find installation package)
When I do the same but not in array - it works
for ($i=0; $i -lt $msiArrayClean.length; $i++){
Write-Host $msiArrayClean[$i]
& msiexec.exe /x $msiArrayClean[$i]
}
here the output of Write Host
How i come to $msiArrayClean
$msiCache = get-wmiobject Win32_Product | Where-Object Name -like "*7-Zip*" | Format-Table LocalPackage -AutoSize -HideTableHeaders
$msiString = $msiCache | Out-String
$msiArrayWithEmptyLines = $msiString -split "`n"
$msiArray = $msiArrayWithEmptyLines.Split('', [System.StringSplitOptions]::RemoveEmptyEntries)
$msiArrayCleanString = $msiArray | Out-String
$msiArrayClean = $msiArrayCleanString -split "`n"

Answer 1

A few caveats up front:
Format-* cmdlets output objects whose sole purpose is to provide formatting instructions to PowerShell's output-formatting system - see this answer. In short: only ever use Format-* cmdlets to format data for display, never for subsequent programmatic processing.
The CIM cmdlets (e.g., Get-CimInstance) superseded the WMI cmdlets (e.g., Get-WmiObject) in PowerShell v3 (released in September 2012). Therefore, the WMI cmdlets should be avoided, not least because PowerShell (Core) (version 6 and above), where all future effort will go, doesn't even have them anymore. For more information, see this answer.
Use of the Win32_Product WMI class is discouraged, both for reasons of performance and due to potentially unwanted side effects - see this Microsoft article.
An alternative - available in Windows PowerShell only (not in PowerShell (Core) 7+) - is to use the following to get uninstall command lines and execute them via cmd /c:
Get-Package -ProviderName Programs -IncludeWindowsInstaller |
ForEach-Object { $_.meta.attributes['UninstallString'] }
If you need to stick with Win32_Product:
# Get the MSI package paths of all installed products, where defined.
$msiCache = (Get-CimInstance Win32_Product).LocalPackage -ne $null
foreach ($msiPackagePath in $msiCache) {
if (Test-Path -LiteralPath $msiPackagePath) {
# Note that msiexec.exe runs *asynchronously*.
# Use Start-Process -Wait to wait for each call to complete.
& msiexec.exe /x $msiPackagePath
} else {
Write-Warning "Package not found: $msiPackagePath"
}
}

Answer 2

I don't like reaching to WMI, since its perfomance is the issue. I prefer to do it via registry and it worked for me many times. Code explanation in comments.
$name = "7-zip"
#Get all items from registry
foreach ($obj in Get-ChildItem "HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall") {
#Get DisplayName property of registry
$dname = $obj.GetValue("DisplayName")
#Search for given name
if ($dname -like "*$name*") {
#Get uninstall string (it gets you msiexec /I{APPID})
$uninstString = $obj.GetValue("UninstallString")
foreach ($line in $uninstString) {
#Getting GUID from "{" to "}""
$found = $line -match '(\{.+\}).*'
if ($found) {
#If found - get GUID
$appid = $matches[1]
Write-Output "About to uninstall app $appid"
#Start uninstallation
Start-Process "msiexec.exe" -arg "/X $appid /qb" -Wait
}
}
}
}
Edit: Added solution with msi path after Nehat's comment as this works for me (I tried to minimize the code :))
$msiCache = get-wmiobject Win32_Product | Where-Object Name -like "*7-Zip*" | Format-Table LocalPackage -AutoSize -HideTableHeaders
foreach ($msi in $msiCache | Out-String) {
if ([string]::IsNullOrEmpty($msi)) {
continue
}
Write-Host $msi
Start-Process "msiexec.exe" -arg "/x $msi" -Wait
}